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Evaluation of the protein truncation test and mutation detection in the NF1 gene: mutational analysis of 15 known and 40 unknown mutations.

Abstract：

:The neurofibromatosis type 1 (NF1) gene located at 17q 11.2 contains 60 exons and spans 350 kb of genomic DNA. Mutation analysis has been hampered by the large size of the gene, the high rate of new mutations, a lack of mutational clustering and the presence of numerous homologous loci. Mutation detection methods based on the direct analysis of a gene's RNA transcript permit the rapid screening of large multi-exonic genes. However, the detection of frame-shift or nonsense mutations can be limited by instability of the mutant mRNA species due to nonsense-mediated decay. In order to determine the frequency of this allelic exclusion, total lymphocyte RNA was analysed from 15 NF1 patients with known truncating mutations and a panel of 40 NF1 patients with unknown mutations. The level of expression of the mutant message was greatly reduced in 2 of the 15 samples (13%), and 3 of the 18 informative samples from the panel of 40. A coupled reverse-transcription polymerase chain reaction and protein truncation test method was subsequently applied to screen RNA from the panel of 40 unrelated NF1 patients. Aberrant polypeptide bands were identified and characterised in 21 samples (53%). The mutations identified were 479del107;ins31, 495delTGTT, 1127delTGAT, R416X, R440X, 1446del 62, 1541delAG, 2252del 74, 2537insTG, 3456delACTC, R1276X, R1362X, 5749ins171, 6084del280, 6487insA, R2214X, 6791insA, 6858del141, 7458delC, 7676 2A-G and 8081delC. These mutations were uniformly distributed across the gene and 14 represent novel changes that contribute to the germline mutational spectrum of the NF1 gene.

journal_name

Hum Genet

journal_title

Human genetics

authors

Osborn MJ,Upadhyaya M

doi

10.1007/s004399900135

keywords:

subject

Has Abstract

pub_date

1999-10-01 00:00:00

pages

327-32

issue

4

eissn

0340-6717

issn

1432-1203

journal_volume

105

pub_type

杂志文章

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